18516479 has 2 divisors, whose sum is σ = 18516480. Its totient is φ = 18516478.

The previous prime is 18516439. The next prime is 18516499. The reversal of 18516479 is 97461581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18516479 - 2¹² = 18512383 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18516409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9258239 + 9258240.

It is an arithmetic number, because the mean of its divisors is an integer number (9258240).

Almost surely, 2^18516479 is an apocalyptic number.

18516479 is a deficient number, since it is larger than the sum of its proper divisors (1).

18516479 is an equidigital number, since it uses as much as digits as its factorization.

18516479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The square root of 18516479 is about 4303.0778519567. The cubic root of 18516479 is about 264.5571290366.

The spelling of 18516479 in words is "eighteen million, five hundred sixteen thousand, four hundred seventy-nine".